refactor: simplify lobby server architecture and update app metadata

* remove legacy data bridge, RPC, and server bootstrap files
* simplify lobby scene and node hierarchy
* rename lobby UI scene path and update signal handlers
* replace the application icon and configure the boot splash
* add project description and version metadata

scenes/screens/lobby_screen/lobby_base.gd

@@ -1,4 +1,4 @@
-class_name LobbyBase extends Control
+class_name LobbyBase extends Node
 
 
 const MATCH_ENTRY                         = preload("res://scenes/screens/lobby_screen/match_entry.tscn")
@@ -15,12 +15,6 @@ const MATCH_ENTRY                         = preload("res://scenes/screens/lobby_
 @onready var server: Node = $server
 
 
-
-func _on_home_bttn_pressed() -> void:
-	Globals.game_state.set_game_scene(
-		"res://scenes/screens/start_screen/start.tscn"
-	)
-
 func _on_host_start_bttn_pressed() -> void:
 	server.start_server(host_address_input.text, int(host_port_range.value))
 
@@ -32,8 +26,5 @@ func _on_host_stop_bttn_pressed() -> void:
 	host_start_bttn.visible   = true
 	host_stop_bttn.visible    = false
 
-func _on_search_bttn_pressed() -> void:
-	pass
-
-func _on_match_search_bttn_button_up() -> void:
+func _on_match_search_bttn_pressed() -> void:
 	pass